Electric cable



(Modem D. BROOK-s, Jr.

ELBGTRIG CABLE.

No. 437,330. Patented Sept. 30, 1890.

me noms Penas cat, mow-mwst, wAsnwcYuN, nA c.

UNITED STATES PATENT OFFICE.

DAVID BROOKS, JR., OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE ELECTRIC CABLE4 CONSTRUCTION AND MAINTENANCE COMPANY, OF

PENNSYLVANIA.

ELECTRIC CABLE.

SPECIFICATION forming part of Letters Patent No. 437,330, dated September 30, 1890.

Application tiled December 29, 1888. Serial No. 295,109. (Model.)

To all whom. t may concern:

Be it known that I, DAVID BROOKS, Jr., a citizen of the United States, residing in the cityand county of Philadelphia, State ot' Penn- 5 Sylvania, have invented a new and usefulImprovement in Electric WVires or Cables, which improvement is fully set forth in the following specification and accompanying drawings.

My invention consists of an electric wire or 1o cable insulated, as hereinafter fully set forth and definitely claimed, whereby the employment of an insulating material or compound in liquid, molten, or other condition is obviated.

Figure l representsa sectional perspective view of a portion of a cable embodying my invention. Fig. 2 represents a perspective View of my improved cable, showing the manner of sealing the end thereof.

In carrying out my invention I take an eleczo tric wire cable, composed of a bunch of fibrous or tissue covered wires, and subject the same to a drying temperature of about 212 for a period of twenty-four hours, more or less, so as to entirely expel all moisture from the coverz 5 ings of all ot the Wires of the bunch. Im-

mediately after drying, while the cable is yet warm, an air-tight covering or incasementsuch as lead, rubber, or tin-foil, or a combination thereof-is placed around the cable or 3o bunch of Wires. Itwill be seen that the cable now consists of an outside air-tight covering and an inside bunch of dried fibrous-covered wires, dry air occupying the interstices of the fibrous covering, instead of the usual insulating material employed in liquid, molten, or

other condition, thus avoiding the employnient of such material and the operation of applying the same by saturation or filling in.

After the iibrous-covered wires are dry they may be coated with powder-such as flour, soapstone, marble-dust, dse-and the ends or teminals of a cable are saturated with a suitable compound or sealed up, as shown in Fig. 2, to prevent moisture from entering the fibrous materials from the ends.

Owing to the coating of powder, the moisture which may enter at any place where a cut or break occurs in the outside air-tight covering cannot penetrate but to a limited extent, as the powder-such as flour-forms abarrier to the rapid absorption of water. This'allows the break to be repaired before any considerable damage has occurred.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. An electric cable consisting of a bunch of dry fibrous-covered wires having the interstices between said wires filled with dry air, a coating of powder on said wires, and an air-tight incasement inclosing the same, substantially as described.

2. A bunch of dry fibrous-covered wires with the interstices filled with dry air and an airtight incasement inclosing the same, forming a cable, the ends whereof are provided with means for preventing moisture from reaching the fibrous coverings ot the wires, substantially as described.

DAVID BROOKS, JR.

Witnesses:

JOHN A. WIEDERSHEIM, A. P. JENNINGS. 

